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Note 5 - Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] |
|  | June 30, 2022 (Unaudited) |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 8,756 |  |  | $ | 2 |  |  | $ | (23 | ) |  | $ | 8,735 |
Available-for-sale - matures after one year through five years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 99,386 |  |  |  | — |  |  |  | (5,149 | ) |  |  | 94,237 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | $ | 108,142 |  |  | $ | 2 |  |  | $ | (5,172 | ) |  | $ | 102,972 |
|  | December 31, 2021 |
|  | Amortized cost |  |  | Gross unrealized gains |  |  | Gross unrealized losses |  |  | Fair value |
Available-for-sale - matures within one year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 11,937 |  |  | $ | 39 |  |  | $ | (7 | ) |  | $ | 11,969 |
Available-for-sale - matures after one year through five years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 78,920 |  |  |  | 227 |  |  |  | (818 | ) |  |  | 78,329 |
Total |  | $ | 90,857 |  |  | $ | 266 |  |  | $ | (825 | ) |  | $ | 90,298 |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Less than 12 months |  |  | 12 months or greater |
|  | Fair value |  |  | Gross unrealized loss |  |  | Fair value |  |  | Gross unrealized loss |
As of June 30, 2022 (unaudited) |  | $ | 82,144 |  |  | $ | (3,264 | ) |  | $ | 20,328 |  |  | $ | (1,908 | )
As of December 31, 2021 |  | $ | 53,412 |  |  | $ | (667 | ) |  | $ | 12,039 |  |  | $ | (158 | )
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | Six months ended June 30, |  |  | Three months ended June 30, |
|  | 2022 (unaudited) |  |  | 2021 (unaudited) |  |  | 2022 (unaudited) |  |  | 2021 (unaudited) |
Gross realized gains from sale of available-for-sale marketable securities |  | $ | — |  |  | $ | 43 |  |  | $ | — |  |  | $ | 43 |
Gross realized losses from sale of available-for-sale marketable securities |  | $ | (21 | ) |  | $ | (28 | ) |  | $ | (21 | ) |  | $ | (28 | )

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